<!DOCTYPE HTML>
<html>
<head>
<meta name="viewport" content="initial-scale=1">
<title>Tab Switch Canvas 2D Test: Diagonally opposite green and blue box, over red box</title>
<style type="text/css">
.nomargin {
  margin: 0px auto;
}
</style>
<script>
let g_swapsBeforeAck = 15;
let g_canvas;
let g_c2d;

function waitForFinish()
{
  if (g_swapsBeforeAck == 0) {
    sendResult("SUCCESS");
  } else {
    g_swapsBeforeAck--;
    window.requestAnimationFrame(waitForFinish);
  }
}

function handleVisibilityChange() {
  if (document.visibilityState == "visible")
    waitForFinish();
}

function sendResult(status) {
  if (domAutomationController) {
    domAutomationController.send(status);
  } else {
    console.log(status);
  }
}

function main()
{
  document.addEventListener("visibilitychange", handleVisibilityChange, false);
  g_canvas = document.getElementById("c");
  g_c2d = g_canvas.getContext("2d");
  g_c2d.clearRect(0, 0, g_canvas.width, g_canvas.height);
  g_c2d.fillStyle = "red";
  g_c2d.fillRect(0, 0, 100, 100);
  // Verify that output doesn't get flipped vertically.
  g_c2d.fillStyle = "green";
  g_c2d.fillRect(0, 0, 50, 50);
  g_c2d.fillStyle = "blue";
  g_c2d.fillRect(50, 50, 50, 50);
  sendResult("READY");
}
</script>
</head>
<body onload="main()" class="nomargin">
<canvas id="c" width="100" height="100" class="nomargin" style="background-color:black"></canvas>
</body>
</html>
